Entombed - Clandestine. I s\aw them play these songs live with LG on vocals before the album was released, but he left before recording and Nick filled in. The album is a great follow up to Left Hand Path, but it's hard to suffer through those vocals. Too bad by the time LG came back, musically they went down a path I hated.
Nevermore - Enemies of Reality- thankfully they actually did with this one. They took an album that was essentially unlistenable & remixed/mastered it into a excellent piece of work.
Morbid Angel - Heretic - I still contend there are some good tunes on this thing (absent all the instrumental nonsense) but that production is a head scratcher. I'm not sure how the band/producer can listen to it and think "yeah this sounds good". Trey usually knows what he is doing but he was asleep at the wheel on this one.